You need to obtain one first, I have placed a link below that links to a page that should be able to help you out with this.
Note: Pets depend on your summoning level.
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To get rid of a pet cat in runescape just simply release it. Open the pet catalog and click the release button. And when it say "Do you really want to release" say YES!! Or you can starve your cat to death.
I would say an Ibis is the best way to level summoning in terms of Shards used and exp given.
You can have as many pets as you want, but you can only have one pet out at the same time ;)
Crunchy claw token can be spend on Nung (a side quest of recipe for disaster quest) to buy a pet crab (need 40 summon) Nung is underwater which mean you need to dive there in port khazard talk to Murphy with you diving apparatus on and you should find Nung straight ahead
No, a Synchro Summon is a kind of Special Summon.